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Ultrasound-Guided Diagnosis and Aspiration of Baker’s Cyst

On musculoskeletal ultrasound, the diagnosis of a Baker’s cyst can be established by identification of a popliteal cystic lesion, with a fluid-containing neck between the tendon of semimembranosus and medial head of gastrocnemius. A color Doppler view should be obtained to rule out any vascular lesion. Under real-time ultrasound-guidance, aspiration of the Baker’s cyst can be safely and accurately performed.